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    </li> <li title="更新时间" class="lis"><img src="/assets/img/clock.ffb2d0be.svg" class="icons">2021-04-16
    </li> <li title="浏览人数" class="lis"><img src="/assets/img/eye.e9087eed.svg" class="icons">0
    </li></ul>  <div class="theme-default-content content__default"><h3 id="kb-单位转换"><a href="#kb-单位转换" class="header-anchor">#</a> KB 单位转换</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">/**
 * @name twoDecimal
 * @param {Number} val 传入数字
 * @param {Number} len 位数-需要取小数点后几位-默认2位
 * @remake Math.round(val) 四舍五入取整
 * @remake Math.floor(val) 向下取整
 * @description 运算，取小数点后两位
 */</span>
<span class="token keyword">function</span> <span class="token function">twoDecimal</span><span class="token punctuation">(</span><span class="token parameter">val <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> len <span class="token operator">=</span> <span class="token number">2</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> digit <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">pow</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> len<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//指数幂</span>
  <span class="token keyword">let</span> num <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">round</span><span class="token punctuation">(</span>val <span class="token operator">*</span> digit<span class="token punctuation">)</span> <span class="token operator">/</span> digit<span class="token punctuation">;</span>
  <span class="token keyword">return</span> num<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">/**
 *
 * @param {Number} num1 标准数据
 * @param {Number} num2 源数据
 * @description 计算num2是num1的最大次方
 * @returns 最大次方
 */</span>
<span class="token keyword">const</span> <span class="token function-variable function">power</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">num1<span class="token punctuation">,</span> num2</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> _power <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>
    num1 <span class="token operator">&amp;&amp;</span>
    num2 <span class="token operator">&amp;&amp;</span>
    <span class="token keyword">typeof</span> num1 <span class="token operator">===</span> <span class="token string">&quot;number&quot;</span> <span class="token operator">&amp;&amp;</span>
    <span class="token keyword">typeof</span> num2 <span class="token operator">===</span> <span class="token string">&quot;number&quot;</span> <span class="token operator">&amp;&amp;</span>
    num2 <span class="token operator">&gt;</span> num1
  <span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">//递归</span>
    <span class="token keyword">function</span> <span class="token function">numPower</span><span class="token punctuation">(</span><span class="token parameter">val1<span class="token punctuation">,</span> val2</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">let</span> _quotient <span class="token operator">=</span> val2 <span class="token operator">/</span> val1<span class="token punctuation">;</span> <span class="token comment">//商</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>_quotient <span class="token operator">&gt;=</span> val1<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        _power <span class="token operator">+=</span> <span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token function">numPower</span><span class="token punctuation">(</span>num1<span class="token punctuation">,</span> _quotient<span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token function">numPower</span><span class="token punctuation">(</span>num1<span class="token punctuation">,</span> num2<span class="token punctuation">)</span><span class="token punctuation">;</span>
    _power <span class="token operator">+=</span> <span class="token number">1</span><span class="token punctuation">;</span> <span class="token comment">//num2&gt;num1-最初始+1</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> _power<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">/**
 * @name unitConver
 * @param {Number} val 原始大小/B(byte:字节)=8b(bit:比特位); 1字符=2字节
 * @remake B,KB,M,G,T,PB,EB,ZB,YB,BB
 * @remake Math.pow(1024, x);x=1,2,3,4,5,6,7,8,9,10
 * @return 返回相对应的大小描述
 */</span>
<span class="token keyword">function</span> <span class="token function">unitConver</span><span class="token punctuation">(</span><span class="token parameter">val <span class="token operator">=</span> <span class="token number">0</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> size <span class="token operator">=</span> <span class="token function">Number</span><span class="token punctuation">(</span>val<span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token number">0</span><span class="token punctuation">;</span> <span class="token comment">//规范传入值</span>
  <span class="token keyword">let</span> sizeList <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">&quot;B&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;KB&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;M&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;G&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;T&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;PB&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;EB&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;ZB&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;YB&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;BB&quot;</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
  <span class="token keyword">let</span> standNum <span class="token operator">=</span> <span class="token number">1024</span><span class="token punctuation">;</span> <span class="token comment">//标准值</span>
  <span class="token keyword">let</span> _power <span class="token operator">=</span> <span class="token function">power</span><span class="token punctuation">(</span>standNum<span class="token punctuation">,</span> val<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//幂指</span>
  <span class="token keyword">let</span> tag <span class="token operator">=</span> sizeList<span class="token punctuation">[</span>_power<span class="token punctuation">]</span><span class="token punctuation">;</span>
  size <span class="token operator">=</span> <span class="token function">twoDecimal</span><span class="token punctuation">(</span>size <span class="token operator">/</span> Math<span class="token punctuation">.</span><span class="token function">pow</span><span class="token punctuation">(</span>standNum<span class="token punctuation">,</span> _power<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> size <span class="token operator">+</span> tag<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
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